11... a7a6  12. b5e2 Nakamura decides to retreat with the bishop. The other plan is to capture on c6 and play with a quick d2-d4. 12... f8e7  13. c3e4 The knight looks pretty on e4, but it can be attacked with f6-f5 and the pressure on c5 isn't dangerous. 13... d8b6 